I think the list must be much longer, would be good to put performance and use of machine learning side by side as well as sort by type of strategy.
The following are the list of funds or trading firms using artificial intelligence or machine learning for their research and trading purposes. There are probably a lot more than this but many prefer to stay very quiet. The list and info here is compiled from public sources amongst the links mentioned below in the references sections, from company websites and wiki if available. TWO SIGMA INVESTMENTS According to Wiki, Two Sigma uses a variety of technological methods, including high-frequency trading (HFT), artificial intelligence, machine learning, and distributed computing, for its trading strategies. BRIDGEWATER ASSOCIATES They appear to be starting a new, artificial-intelligence unit with about half a dozen people. The team will report to David Ferrucci, who joined Bridgewater at the end of 2012 after leading the International Business Machines Corp. etc.